Merging two routes is the only option here, I think.
- Recreate the entire route in TransDEM, select custom ground textures (pick the predefined 128 color set), load and apply ortho-imagery as ground textures.
- Import the new route with Content Manager. In Surveyor, remove all the baseboards from the new route that you want to keep from the original route.
- In Surveyor, merge the two routes
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The route is the infamous Tua Line (Linha do Tua) in Portugal
I probably mentioned it before, I was lucky to travel the line from Tua to Mirandela in the early 2000s, by railcar. The section above Mirandela was already closed, and Mirandela itself offered a few additional local railcar services, titled "Metro".